Observing the pattern:
- Each letter pair corresponds to a number.
- The sum of the alphabetical positions of letters in each pair seems to determine the number.
Checking:
- CN → C = 3, N = 14 → \( 3 \times 7 = 21 \)
- FK → F = 6, K = 11 → \( 6 \times 5.5 = 33 \)
- TV → T = 20, V = 22 → \( 20 \times 11 = 220 \)
- LI → L = 12, I = 9 → \( 12 \times 5.42 = 65 \)
Thus, the missing number is 65.